ACS: Inquiry in Action - Heating and Cooling (Lesson 5.2): Heating Can Make a Change That Cannot Go Back Again

Students design and conduct an experiment to see if baking powder causes more bubbling in warm or cold water to investigate the question: Does baking powder produce more bubbles when it is heated or cooled?

Objective

Students will be able to explain that when some substances are heated to a certain extent, they change in a way that they cannot be changed back by cooling them.

Key Concepts

  • Heating can make a substance change.
  • Heating can make some substances change in a way that they cannot be changed back again by cooling.

NGSS Alignment

  • NGSS 2-PS1-4: Construct an argument with evidence that some changes caused by heating and cooling can be reversed and some cannot.

Summary

In the previous lesson, students saw that some substances that change when heated can be changed back again when cooled.

  • Students see a time lapse video of cookie dough being baked into cookies.
  • Students participate in a class discussion about heating causing changes that cannot be reversed when cooled.
  • Students learn that heating baking powder in the cookie dough makes a gas and causes the little holes in the cookie.
  • Students design and conduct an experiment to see if baking powder causes more bubbling when it is warm or cold.

Evaluation

Download the student activity sheet and distribute one per student when specified in the activity. The activity sheet will serve as the Evaluate component of the 5-E lesson plan.


Science Topics
Chemistry, Heat, Matter
K-6, Educator
2nd Grade
Descriptions of PDFs

Lesson Plan (PDF) | Student Activity Sheet (PDF) | Teacher Background (PDF) | Connections to NGSS (PDF)

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